society > authority > delegated authority > action or function of a delegate or deputy > act as deputy for [verb (transitive)] > speak for or on behalf of another (2)
To make a speech or plea in place of or on behalf of (a person); in later use esp. to plead for. Also, to make representations concerning (a thing)…
transitive. To act as the mouthpiece or spokesperson of (a body of people); to express the opinions of. Now rare.